What adhesive is used to bond magnets?

Anaerobic adhesives (often with an activator) for fast fixture times, heat-cured one-component epoxies for the highest strength and temperature resistance, and structural acrylics as a middle ground. Choose for the rotor's maximum temperature and centrifugal load.

Which dispensing valve should I choose?

Time-pressure valves are cheap but drift with viscosity and temperature. Volumetric (auger or progressive-cavity) valves give repeatable shot sizes for structural bonds, and jetting valves are fast for small dots.

How do I check bond quality?

Check bead position and volume (vision or weighing), cure conditions per lot, and run push-out or shear tests on sample rotors at the maximum operating temperature.

Dispensing System

AutomatedSemi-automatic

Applies adhesive for bonding rotor magnets.

✓ Expert reviewed All content on this page has been reviewed by a senior motor engineer.

Selection criteria

Shot-volume accuracy, 1K / 2K adhesive capability.

Supply chain

Shenzhen and Dongguan have a large dispensing-equipment industry, plus local offices of Japanese and US valve brands. For magnet bonding, check shot-to-shot volume repeatability and suitability for the chosen adhesive.

Buyer FAQ

What adhesive is used to bond magnets?: Anaerobic adhesives (often with an activator) for fast fixture times, heat-cured one-component epoxies for the highest strength and temperature resistance, and structural acrylics as a middle ground. Choose for the rotor's maximum temperature and centrifugal load.
Which dispensing valve should I choose?: Time-pressure valves are cheap but drift with viscosity and temperature. Volumetric (auger or progressive-cavity) valves give repeatable shot sizes for structural bonds, and jetting valves are fast for small dots.
How do I check bond quality?: Check bead position and volume (vision or weighing), cure conditions per lot, and run push-out or shear tests on sample rotors at the maximum operating temperature.

Where it is used

Motor assembly process

57 mm Inner-rotor BLDC Motor7. Rotor assembly
42 mm Two-phase Hybrid Stepper Motor (NEMA 17)7. Rotor assembly
57 mm Two-phase Hybrid Stepper Motor (NEMA 23)7. Rotor assembly
37 mm Brushed DC Gear Motor (spur gearbox)8. Magnet fitting & magnetizing, 11. Gearbox assembly
86 mm Two-phase Hybrid Stepper Motor (NEMA 34)7. Rotor assembly
57 mm Integrated BLDC Motor (built-in driver)7. Rotor assembly, 10. Driver integration
70 mm Outer-rotor BLDC Motor8. Rotor cup assembly
AC Servo Motor (60–130 mm flange)8. Rotor assembly
Coreless Brushed DC Motor (16–22 mm)2. Coil forming & curing, 3. Rotor assembly, 6. Rotor balancing, 7. Magnet bonding & magnetizing
Linear Motor & Voice-coil Motor6. Vacuum potting & curing, 8. Magnet track bonding, 9. Track cover, sealing & magnetic check, 10. Voice-coil motor assembly
Direct-drive Torque Motor & Robot Joint Module4. Stator test, potting & curing, 5. Rotor magnet bonding, 9. Strain-wave gear assembly & lubrication (joint module)